package unit21.classLoader;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Caesar {
	public static void main(String[] args) throws FileNotFoundException, IOException {
		if(args.length!=3){
			System.out.println("USAGE : Java classloader.caesar in out key");
			return ;
		}
		try(FileInputStream in=new FileInputStream(args[0]);FileOutputStream out=new FileOutputStream(args[1])){
			int key=Integer.parseInt(args[2]);
			int ch;
			while((ch=in.read())!=-1){
				byte c=(byte) (ch+key);
				out.write(c);
			}
		}
	}
}
